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Ultrathin 65Mn cold-rolled wide steel strip and manufacturing method thereof

A manufacturing method and specification technology, applied in the field of metal material forming, can solve the problems of high difficulty in cold-rolling wide steel strips, high resistance to cold-rolling deformation, and high difficulty in rolling, so as to achieve increased grain boundary area, increased deformation energy, The effect of improving productivity

Active Publication Date: 2021-09-17
新余钢铁股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

65Mn spring steel is a high-carbon high-manganese steel with high strength and poor plasticity
Compared with metal titanium, 65Mn steel has high hardness, poor plasticity, high resistance to cold rolling deformation, and more difficult rolling
Therefore, it is difficult to produce 65Mn cold-rolled wide steel strips with a thickness specification of ≤0.30mm by this method

Method used

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  • Ultrathin 65Mn cold-rolled wide steel strip and manufacturing method thereof
  • Ultrathin 65Mn cold-rolled wide steel strip and manufacturing method thereof
  • Ultrathin 65Mn cold-rolled wide steel strip and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0082] A method for producing an ultra-thin cold-rolled wide strip 65Mn specifications, the choice of hot-rolled coil of steel material is 65Mn, its main chemical composition of C: 0.66%, Mn: 0.98%, S: 0.003%, P: 0.018 %, Si: 0.22%, Cr: 0.14%, Ni: 0.01%, Cu: 0.03%, the balance being Fe and unavoidable impurities. Material specifications for 3.00mm × 1250mm, after cold rolling to final gauge 0.30mm × 1230mm, production steps are as follows:

[0083] 1) slow cooling: 3.0mm thickness of the material hot coil suspended into 65Mn Xinyu Iron & Steel invention, "slow-cooling device excellent in high-carbon steel hot strip (Patent No. ZL2020 2 1216515.2)" Slow after cooling 66h, coil temperature is lowered to 75 deg.] C until a pit, transported to the pickling line library materials;

[0084] 2) Pickling: pickling line using the push-pull pickling the hot-rolled wide strip, pickling speed of 123m / min, the acid concentration of 125g / l, using steam heating the acid, the acid temperature...

Embodiment 2

[0094] A method for producing an ultra-thin cold-rolled wide strip 65Mn specifications, the choice of hot-rolled coil of steel material is 65Mn, its main chemical composition of C: 0.67%, Mn: 0.97%, S: 0.002%, P: 0.017 %, Si: 0.23%, Cr: 0.14%, Ni: 0.02%, Cu: 0.03%, the balance being Fe and unavoidable impurities. Material specifications for 2.75mm × 1180mm, after cold rolling to final gauge 0.22mm × 1160mm:

[0095] 1) slow cooling: 2.75mm thickness of the material hot coil suspended into 65Mn Xinyu Iron & Steel invention, "slow-cooling apparatus preferably high carbon hot-rolled steel strip (Patent No. ZL2020 2 1216515.2)" Slow after cooling 65h, coil temperature is lowered to 74 deg.] C until a pit, transported to the pickling line library materials;

[0096] 2) Pickling: pickling line using the push-pull pickling the hot-rolled wide strip, pickling speed of 124m / min, the acid concentration of 125g / l, using steam heating the acid, the acid temperature is 73 ℃;

[0097] 3) Fi...

Embodiment 3

[0106] A method for producing an ultra-thin cold-rolled wide strip 65Mn specifications, the choice of hot-rolled coil of steel material is 65Mn, its main chemical composition of C: 0.66%, Mn: 0.98%, S: 0.003%, P: 0.015 %, Si: 0.21%, Cr: 0.16%, Ni: 0.02%, Cu: 0.02%, the balance being Fe and unavoidable impurities. Material specifications for 2.50mm × 1150mm, after cold rolling to final gauge 0.15mm × 1120mm:

[0107] 1) slow cooling: 2.50mm thickness of the material hot coil suspended into 65Mn Xinyu Iron & Steel invention, "slow-cooling apparatus preferably high carbon hot-rolled steel strip (Patent No. ZL202021216515.2)" Slow 62 h cold, until the coiling temperature after the pit 76 deg.] C, transported to a pickling line library materials;

[0108] 2) Pickling: pickling line using the push-pull pickling the hot-rolled wide strip, pickling speed of 126m / min, the acid concentration of 165g / l, using steam heating the acid, the acid temperature is 76 deg.] C;

[0109] 3) First R...

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Abstract

The invention provides an ultrathin 65Mn cold-rolled wide steel strip and a manufacturing method of the ultrathin 65Mn cold-rolled wide steel strip. According to optimal cold-rolling technological parameters such as the reduction schedule, the rolling force, the rolling speed and the tension for joint production of the ultrathin 65Mn cold-rolled wide steel strip by adopting a 1450mm single-machine-frame six-roller reversible rolling mill and a Sendzimir twenty-roller reversible rolling mill, front-pass large-reduction rough rolling of the six-roller rolling mill and rear-pass thin-specification finish rolling of the twenty-roller rolling mill are achieved, the complementary advantages of equipment are fully achieved, the technical problems that rolling of the ultrathin 65Mn cold-rolled wide steel strip is unstable, the strip is prone to breakage, the plate shape control is difficult, and the rolling difficulty is high are solved, and the situations that the size precision of products is high, the plate shape is flat, and the quality is stable are guaranteed.

Description

Technical field [0001] The present invention belongs to the technical field forming a metal material, particularly relates to an ultra-thin cold-rolled wide strip 65Mn specifications and its manufacturing method, in particular with six roller mill and roll mill twenty joint production of ultra-thin cold-rolled wide strip 65Mn specifications. Background technique [0002] The deformed spring steel 65Mn, after heat treatment, has high strength, good toughness, fatigue resistance and other superior properties, it is widely used in automobiles, machinery and hardware industries. Especially high thin gauge thickness of less than 0.30mm 65Mn cold-rolled strip, quality requirements, strict technical requirements, high value-added products, primarily for the manufacture of a valve spring, the valve sheet, belt spring, spring washer, hair Article coil spring, tape and other auto parts and hardware. 65Mn spring steel is high carbon steel, high strength and ductility is poor. The thinner th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/36B21B1/40B21B1/22B21B45/02C21D1/32C21D1/74C21D6/00C21D8/02C21D9/52C22C38/02C22C38/04C22C38/42
CPCB21B1/36B21B1/40B21B1/22B21B45/0203C21D1/32C21D8/0221C21D9/52C21D1/74C21D6/005C21D6/008C21D6/004C22C38/02C22C38/04C22C38/42C21D2211/009C21D2211/005Y02P10/20
Inventor 喻建林帅勇唐小勇吕瑞国冯小明刘涛易新平杨帆刘志芳欧阳帆钟小杰李小青熊慎凯陈小波
Owner 新余钢铁股份有限公司
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